Weather History for San Francisco, CA

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Sunday, January 31, 2010

  Actual Average Record
Temperature  
Mean Temperature 51 °F 51 °F  
Max Temperature 55 °F 58 °F 69 °F (1976)
Min Temperature 47 °F 45 °F 32 °F (1950)
Degree Days  
Heating Degree Days 14 14  
Month to date heating degree days 418 455  
Since 1 July heating degree days 1412 1467  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 0 0  
Moisture  
Dew Point 47 °F    
Average Humidity 92    
Maximum Humidity 100    
Minimum Humidity 83    
Precipitation  
Precipitation 0.00 in 0.14 in 1.99 in (1963)
Month to date precipitation 5.97 4.19  
Year to date precipitation 5.97 4.19  
Since 1 July precipitation 12.47 11.76  
Sea Level Pressure  
Sea Level Pressure 30.01 in    
Wind  
Wind Speed 3 mph (SE)    
Max Wind Speed 8 mph    
Max Gust Speed 9 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Astronomy

Jan. 31, 2010 Rise Set
Actual Time 7:13 AM PST 5:32 PM PST
Civil Twilight 6:46 AM PST 6:00 PM PST
Nautical Twilight 6:14 AM PST 6:31 PM PST
Astronomical Twilight 5:44 AM PST 7:02 PM PST
Moon 7:48 PM PST (1/31) 7:59 AM PST (1/31)
Length of Visible Light 11h 13m
Length of Day
10h 18m
Waning Gibbous, 96% of the Moon is Illuminated
Jan 31
Waning Gibbous
Feb 5
Last Quarter
Feb 13
New
Feb 21
First Quarter
Feb 28
Full

Hourly Weather History & Observations

Time (PST) Temp. Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:56 AM 48.9 °F 46.9 °F 93% 30.02 in 10.0 mi SSE 3.5 mph - N/A   Scattered Clouds
1:56 AM 48.9 °F 46.9 °F 93% 30.02 in 10.0 mi South 3.5 mph - N/A   Scattered Clouds
2:40 AM 48.2 °F 46.4 °F 93% 30.03 in 10.0 mi South 3.5 mph - N/A   Mostly Cloudy
2:56 AM 46.9 °F 46.0 °F 97% 30.02 in 10.0 mi SSW 4.6 mph - N/A   Mostly Cloudy
3:56 AM 46.9 °F 45.0 °F 93% 30.01 in 10.0 mi SSE 3.5 mph - N/A   Overcast
4:56 AM 48.0 °F 45.0 °F 89% 30.01 in 10.0 mi South 5.8 mph - N/A   Overcast
5:56 AM 48.0 °F 46.0 °F 93% 30.02 in 10.0 mi SSW 4.6 mph - N/A   Overcast
6:56 AM 48.9 °F 45.0 °F 86% 30.02 in 10.0 mi South 3.5 mph - N/A   Overcast
7:56 AM 48.9 °F 46.0 °F 90% 30.04 in 10.0 mi Calm Calm - N/A   Overcast
8:56 AM 50.0 °F 46.0 °F 86% 30.04 in 10.0 mi SE 4.6 mph - N/A   Overcast
9:56 AM 51.1 °F 46.0 °F 83% 30.05 in 10.0 mi ENE 4.6 mph - N/A   Mostly Cloudy
10:29 AM 51.8 °F 48.2 °F 88% 30.05 in 9.0 mi NE 3.5 mph - N/A   Scattered Clouds
10:56 AM 52.0 °F 46.9 °F 83% 30.05 in 10.0 mi ENE 5.8 mph - N/A   Scattered Clouds
11:56 AM 53.1 °F 48.0 °F 83% 30.03 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
12:56 PM 54.0 °F 48.0 °F 80% 30.00 in 10.0 mi NNE 3.5 mph - N/A   Mostly Cloudy
1:56 PM 53.1 °F 48.0 °F 83% 29.98 in 10.0 mi NNE 4.6 mph - N/A   Mostly Cloudy
2:56 PM 54.0 °F 48.9 °F 83% 29.98 in 10.0 mi North 4.6 mph - N/A   Mostly Cloudy
3:56 PM 53.1 °F 50.0 °F 89% 29.98 in 9.0 mi NNE 3.5 mph - N/A   Mostly Cloudy
4:56 PM 53.1 °F 48.9 °F 86% 29.99 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
5:56 PM 53.1 °F 48.9 °F 86% 29.98 in 10.0 mi WNW 4.6 mph - N/A   Overcast
6:56 PM 53.1 °F 48.9 °F 86% 29.98 in 10.0 mi WNW 3.5 mph - N/A   Overcast
7:56 PM 53.1 °F 50.0 °F 89% 29.98 in 10.0 mi Calm Calm - N/A   Overcast
8:56 PM 52.0 °F 48.0 °F 86% 29.98 in 10.0 mi SSW 4.6 mph - N/A   Overcast
9:56 PM 52.0 °F 46.9 °F 83% 29.97 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
10:56 PM 52.0 °F 48.9 °F 89% 29.98 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
11:56 PM 51.1 °F 46.9 °F 86% 29.97 in 10.0 mi Calm Calm - N/A   Mostly Cloudy